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ADS1285EVM-PDK Bill of Materials, PCB Layout, and Schematics
AVDD1 supply for ADS1285
U2
5.5V
15
IN
OUT
16
IN
OUT
C8
10uF
13
EN
SENSE/FB
AVSS
NR
4
6P4V2
5
6P4V1
NC
6
3P2V
NC
8
1P6V
NC
9
0P8V
NC
10
0P4V
11
0P2V
GND
12
0P1V
PAD
R8
R9
R10
R11
R12
R13
0
0
0
0
0
0
TPS7A4701QRGWRQ1
AVSS
NOTE: If you configure AVDD1 for 3.3V, replace REF6241 with a REF6225!
AVSS supply
J3
-IN
U5
1
-IN
2
GND
C17
8
IN
OUT
10uF
5
Header for connecting an
EN
external negative supply
GND
GND
source, when configuring
FB
6
AVSS to -2.5V
NR/SS
7
DNC
C20
GND
10nF
3
NC
PAD
TPS7A3001DRBR
GND
GND
32
ADS1285EVM-PDK Evaluation Module
AVDD1
1
Default: 5V
20
5.5V
C9
3
10uF
C10
AVSS
10uF
14
19
18
D1
GND
C13
17
PLVA653A,215
1µF
2
7
21
R14
R15
R16
R17
AVSS
0
0
0
0
Header to select AVSS potential
(UNIPOL = GND, BIPOL = -2.5V)
-2.5V
UNIPOL
R26
1
J4
0
-2.5V
R27
C18
11.3k
C19
10nF
2
10uF
R28
10.0k
GND
4
GND
9
GND
Figure 9-11. ADS1285EVM-PDK Power-Supply Schematic
Copyright © 2022 Texas Instruments Incorporated
AVDD2 supply for ADS1285
U3
AVDD2
15
1
Default: 3V
IN
OUT
16
20
IN
OUT
C11
13
3
EN
SENSE/FB
10uF
14
NR
GND
4
6P4V2
5
19
6P4V1
NC
6
18
3P2V
NC
C15
8
17
1P6V
NC
1µF
9
2
0P8V
NC
10
0P4V
11
7
0P2V
GND
12
21
0P1V
PAD
R18
TPS7A4701QRGWRQ1
R19
0
0
AVDD2 is referenced to the ADC's AGND
GND
GND
Vout (V)
2.5
3.0
3.3
4.5
5.0
INSTALLED = Solder 0-Ohm jumper to GND/AVSS
VOUT = 1.4V + ∑ (all grounded pins)
BIPOL
-2.5V
TP4
TP5
AVSS
AVSS
AVSS
GND
GND
AVSS
AVDD supply for DAC1282
U4
5.5V
15
IN
OUT
16
IN
OUT
C12
10uF
13
EN
SENSE/FB
AVSS
NR
4
6P4V2
5
6P4V1
NC
6
3P2V
NC
8
1P6V
NC
9
0P8V
NC
10
0P4V
11
0P2V
GND
12
0P1V
PAD
R20
R21
R22
R23
R24
R25
0
0
0
0
0
0
TPS7A4701QRGWRQ1
AVSS
Do NOT modify!
The DAC1282 requires a 5V analog supply
Programmable LDO Configurations
3P2V
1P6V
0P8V
0P4V
-
-
INSTALLED
-
INSTALLED
-
INSTALLED
-
-
-
INSTALLED
-
-
INSTALLED
-
INSTALLED
INSTALLED
INSTALLED
INSTALLED
INSTALLED
-
-
INSTALLED
GND
GND
SBAU394A – APRIL 2022 – REVISED SEPTEMBER 2022
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AVSS+5V
TP1
1
20
AVSS+5V
3
C14
10uF
14
AVSS
19
18
17
C16
1µF
2
7
21
AVSS
0P2V
0P1V
INSTALLED
-
-
INSTALLED
INSTALLED
-
-
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